Or a question about the probability of PHP, the solution says

Or is the probability of PHP problem solved by saying
Probability calculation function, a lot of online search is this, but do not understand this function, how to solve the process is ~
This array is the ID and the corresponding probability.

Array
(
???? [1] = 1
???? [2] = 5
???? [3] = 10
???? [4] = 12
???? [5] = 22
???? [6] = 50
)

Why is it possible to get the ID of the probability prize?? Get_rand ($arr);

}

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------Solution--------------------
Suppose a:20% b:30% c:50%
$r =rand (1,100)

$r <=20 A Award
20< $r <= (20+30) B Award
(20+30) <= $r C Award

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